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The guanine nucleotide exchange factor C3G is necessary for the formation of focal adhesions and vascular maturation

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Voss,  A. K.
Department of Molecular Cell Biology, MPI for biophysical chemistry, Max Planck Society;

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Gruss,  P.
Department of Molecular Cell Biology, MPI for biophysical chemistry, Max Planck Society;

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Citation

Voss, A. K., Gruss, P., & Thomas, T. (2003). The guanine nucleotide exchange factor C3G is necessary for the formation of focal adhesions and vascular maturation. Development, 130(2), 355-367. Retrieved from http://dev.biologists.org/content/130/2/355.full.pdf+html.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0012-F1A7-8
Abstract
The Ras signalling pathway has major roles in normal cell function and oncogenesis. C3G is a guanine nucleotide exchange factor for members of the Ras family of GTPases. We generated a mouse strain with a hypomorphic C3G allele. C3G(gt/gt) mutant embryos died of vascular defects around E11.5 due to haemorrhage and vascular integrity defects. Vascular supporting cells did not develop appropriately. C3G-deficient fibroblasts responded to PDGF-BB abnormally, exhibited cell adhesion defects and lacked paxillin and integrin-beta1-positive cell adhesions. In contrast, integrin-beta3-positive cell adhesions formed normally. These results show that C3G is required for (1) vascular myogenesis, (2) the formation of paxillin- and integrin beta1-positive, but not integrin beta3-positive, cell adhesions and (3) normal response to PDGF, necessary for vascular myogenesis.